Thanks Allan. Actually, I should have 'fessed up that this is a crop out of the middle of the full frame, which in itself was very lazily composed. This was a quick first obect for the 2nd night, and I didn't want to mess with having the QHY9 aligned in RA and DEC knowing I wasn't taking flats (I figured I might be able to get away with library flats for this orientation when back home). I wasn't going to post, but here's the full frame along with some of the nasty calibration artifacts coming through.....
I should probably also add this was the first time I let fly with any decent number of LRGB exposures with the mono CCD. Little did I realise at the time it would be my ONLY chance to let rip for 12 months the way the weather has been since